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(N0 Modl.) 2 Sheets-Sheet 2 O. W. & G. F. MANKER. ELECTRICAL DEVICE FOR USE IN DENTAL OPERATIONS.

No. 423,617. lgs atented 18, 1890.

. .iiiiiiliilliiilul i N Iii Immim]alllmlmlllmlm WITNESSES 6 /NVENT0/? W ATTORNEYS.

- by the operator and adapted to close the sec- UNITED STATES PATENT OFFICE.

CHARLES W. MANKER, OF NEBRASKA CITY, NEBRASKA, AND GEORGE F. MANKER, OF BEDFORD, IOl/VA, ASSIGNORS OF'ONE-THIRD TO HENRY E. MANKER, OF ELLIOT IOIVA.

ELECTRICAL DEVICE FOR USE IN DENTAL OPERATIONS.

SPECIFICATION forming part of Letters Patent No. 423,617, dated March 18, 1890.

Application filed October 12, 1889.

To all whom it may concern.-

Be it known that we, CHARLES WV. MANKER, of Nebraska City, in the county of Otoe and State of Nebraska, and GEORGE F. MANKER, of Bedford, in the countyof Taylor and State of Iowa, have invented a new and Improved Electrical Device for Use in the Extraction of Teeth and other Dental Operations, of which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a plan view of our improved electrical device for extracting teeth. Fig. 2 is a front elevation, partly in section. Fig. 3 is an end elevation, partly in section. Fig. 4 is a sectional view of a portion of the partition between the compartments, showing its binding-post and contact-spring; and Fig. 5 is a sectional view of a portion of the insulating-plate, showing its vibratory spring-sup porting post and its contact-spring.

Similar letters of reference indicate corresponding parts in all the views.

The object of our invention is to construct simple and eifective apparatus for sending a secondary current through the tooth of apatient while the toothis being extracted to lessen the pain of extraction. It is also applicable to other dental operations requiring an agent or means of lessening painfor example, excavating cavities in sensitive teeth, lancing gums, treating diseased gums and teeth, and in all dental operations where electricity can be used advantageously.

Onrinvention consists in the combination of a battery, an induction-coil, a vibrator adapted to rapidly interrupt the primary cirouit of the coil, and a finger-piece to be worn ondary circuit, all as will be hereinafter more fully described.

The casing A of the apparatus is divided into two compartments a b. In the compartment at is placed the plunging battery B, having zinc and carbon plates attached to the insulating-cover O. In the upper portion of the compartment Ct is journaled a shaft D, provided with a crank c, which is connected with the cover 0 by a link cl. The shaft D Serial No. 326,821. (No model.)

projects throughthe end of the casing and is nected with springs f g in the compartment b. In the said compartment 1) there are also springs 71 h. The said springs f g h h are arranged in the same horizontal line, so that they may be touched by the springs fag 7L2 h attached to the edge of a plate G of lnsulating material placed in the compartment 1), and resting upon the supports t. To the under surface of the said plate of insulating material are attached the induction-cod H and the vibrator-magnet I, the poles of which project upwardly through the said plate. A postj, secured to the plate G, supports the vibrator-spring it, which carries at its outer end an armature Z, one end of which rests upon one of the poles of the vibrator-magnet I, while the other end is supported near but not in contact with the opposite pole of the said magnet, the spring I; being twisted to admit of this arrangement, or one pole of the magnet I may be made shorter than the other.

To the plate G is attached an oifset arm m, carrying the contact-screw n, which touches the back of the spring 70. The spring 2 communicates electrically with the post 3. One terminal of the magnet I is connected electrically with the offset arm m, and the other terminal of the said magnet is connected with one end of the primary wire of the inductioncoil H, the opposite end of the said primary wire of the induction-coil being connected with the spring The terminals of the secondary wire of the induction-coil H are connected, respectively, with the springs 71 71 and the said springs h h are connected electrically with binding-posts 0 0, arranged in the partition-wall between the compartments (L 1). Between the said binding-posts 0 o are arranged the binding-posts p p. The wires q 0, which are connected with the binding-posts 0 p, are attached to contact-pieces s t, secured to the rubber fin ger-tip u. The conductors q o" are connected with the binding-posts 0 p and with the handles 1) w. The said handles w are grasped by the patient, and the insulating finger-piece u is applied to one of: the fingers of the operator. The elements of the battery B are let down into the solution by turning the shaft D. The vibrator I is thus set into active vibration, and the secondary currents generated in the induction-coil pass in one direction to the handles '0 w, and then to the hands and body of the patient and in the opposite. direction to the contact-pieces s 25. So long as the contact-pieces do not touch the forceps or other instrument in the hands of the operator no currentpasses through the external circuit of the machine; but as soon as they are brought in contact with the forceps or other instrument the current passes through the tooth ot' the patient or other part being operated upon.

The strength of the current may be varied by plunging the core J to a greater or less depth into the induction-coil H, or the core may be made stationaryin the induction-coil H and covered by a non-magnetic shield, which may be raised or lowered to vary the strength of the secondary current. 4

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. In an electrical device for extracting teeth and for other dental operations, the

combination, with the induction-coil H, of the vibrator-magnet I, the vibrator-spring 7c, and the armature Z, having one of its ends resting normally upon one of the poles of the vibrator-magnet, with the opposite end supported within the field of the remaining pole of the vibrator-magnet, substantially as specified.

2. The combination, with the ind notion-coil H, of the insulating finger-cap tt, provided with the contact-pieces s t, by which forceps or any other metallic instrument maybe held by the dentist or operator and made to close and form part. of the circuit of the secondary current, substantially as specified.

3. The combination of theinduction-coil H with the insulating finger-cap u, provided with the contact-pieces s 15, whereby the forceps or any other metallic instrument held in the hand of the dentist or operator and being used for any specific operation can be made to close and form part of the circuit of the secondary current, thereby conveying the electric current to the part being operated upon at the will of the operator, substantially as specified.

4. The combination, with the battery B, of the shaft D, provided with the crank c, the link (I, and the stop 6, substantially as specified.

CHARLES WV. MANKER. GEORGE F. MANKER. Witnesses:

S. S. WEIDNER, ISAAC KERSEY. 

